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Patented Nov. 6, 1888.

UNTTne STATES PATTNT @rrrcre.

GEORGE OULLINGWORTH, OF NEWV YORK, N. Y.

ROTATION DEVICE FOR ROCK=DRILLS.

SPECIFICATION forming part of Letters Patent No. 392,541, dated November6, 1888.

Application filed February 3. 1887. Serial No. 226,372.

.To aZZ whom it may concern.-

Be it known that I, GEORGE E. CULLING- WORTH, of the city and county ofNew York, in the State of New York, have invented a new and usefulImprovement in Rotation Devices for Rock-Drills, of which the followingis a specification.

I will describe in detail a rotation device for a rock-drill, and thenpoint out the novel features in claims.

In the accompanying drawings, Figure 1 is a longitudinal section of suchportions of a rock-drill as are necessary to illustrate myinvention.Fig. 2 is an interior View of the back head, including a transversesection of the spiral bar and a view of the ratchet-head of the bar andtwo pawls acting thereon, the view being taken upon about the plane ofthe dotted line 00 m, Fig. 1. Fig. 3 is a longitudinal section of theback head and adjacent end portion of the cylinder upon about the planeindicated by the dotted line 3 y, Fig. 2; and Fig. 4 represents therotation washer or bearer and the pawl-washers which look it againstturning, including, also, a transverse section of the pawl-pivots.

Similar letters of reference designate corre sponding parts in theseveral figures.

A designates the cylinder, in which is fitted the piston B, and in thispiston is fixed an ordinary nut, 13, which engages with the spiral bar 0and produces the rotation of the piston. The spiral bar 0 has upon itsrear end a'ratchethead, 0, which may be secured in place by a nut, c,and the back head, A, of the cylinder A is recessed, so as to receivewithin it the ratchet-head G and the nut 0. These parts are held inplace by the rotation washer or bearer D, which is of circular form andfitted to a rabbct, cl, formed between the cylinderA and head A, saidrabbet being in this exan1- ple of the invention formed in the head. Thespiral bar 0 passes through the circular washer or bearer D, and in a co.crbore of the cylinder, inward. of Asher or bearer, may be arranged aC'usfllOll of india-rubber, d, and a pro L.on-plate, d, against whichthe piston 1- comes directly. The function of this spring (N0 model.)

is to deaden the impact of the piston in its upward stroke.

The back head, A, is recessed, as shown at b, so as to accommodate twopawls, e, which are supported by pins or pivots e, passing through theback head, A, and, as best shown in Fig. 8, entering the end of thecylinder A. The pivots or bolts e may have immediately inward of theirheads screw-threads which engage the back head, A, and for the remainderof their length may be plain, passing through the pawls e and enteringthe holes 6' in the end of the cylinder.

WVashers 6 which are inward of the pawls e, and through which the boltsor pivots e pass, serve to fill up the space in the head, which isconcentric with the pawl-pivot, and which is equal in thickness or depthto the thickness of the edge of the rotation washer or bearer D. Thesewashers not only fill this space, but the pins or bolts 6 are arrangednear enough to the edge of the circular washer or bearer D, so that thewashers 6 which are thus fixed relatively to the cylinder, enter therecesses e", formed in the edge of the rotation washer or bearer D, asshown in Fig. 4, and thus prevent said washer or bearer from rotating.The washers c constitute locking devices which enter the recesses c andserve the desired purpose.

In the back head, A, at points opposite the pawls e, are transversebores or cylindric sockets f, in which are arranged springs f. In eachbore or socket f is a cup-shaped shoe, f in which one end of the springf bears, and the opposite end of the spring bears against a plug, fclosing the outer end of the bore f, and it may be cup-shaped in itsinterior, as shown in Fig. l, to receive the spring.

\Vhat I claim as my invention, and desire to secure by Letters Patent,is-

1. The combination, with the cylinder and its head and the spiral barand its ratchethead, of the circular washer or bearer D, arrangedbetween the cylinder end and the back head, and through which the barpasses, and which has a recess, 6, in its periphery, and a key orlocking device fixed relatively to the cylinder, engaging said recessand preventing through which the screw passes, and which the rotation ofthe washer or bearer, substanengages said recess to prevent rotation ofthe IO tially as specified. washer or bearer D, substantially as herein2. The combination, with the cylinder and described. 5 its head and thespiral bar and its ratehet- G. R. GULLINGXVORTH.

head, of the circular washer or bearer D, Witnesses: having a recess,6*, in its periphery, a pawl, FREDK. HAYNEs,

e and its ivot-screw e and a washer c, HENRYJ. lllcBnnm.

